Safety apparatus for elevators



G. P. BARKER AND 0. E. UNDERWOOD.

SAFETY APPARATUS FOR ELEV ATORS.

l APPLICATION FILED OCT. 3, I9I9. 1,351,827-, Patentedsept. 7,1920.

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G. P. BIARKEH AND 0. E. UNDERWOOD.,

SAFETY APPARATUS FOR ELEVATORS.

APPLICATION FILED OCT. 3| 1919. y

Patented Sept. 7, 1920.

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G. P. BARKEH AND 0. E. UNDERWOOD. SAFETY APPARATUS FOR ELEvAToRs.

APPUCATON FILED OCT. 3,1919. 1,351,827. y PatentedSept. 7, 1920.

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UNITED STATES PATENT OFFICE.

SAFETY APPARATUS EOE ELEvA'rOR's.

Specification of Letters iatent. i Patented Sept'. 7, 1920;

Application inea' October 3, 1919. serial ad. 325,148.

To all whom it may concern:

Be it known that we, GEORGE P. BAKKER and OLrvEiiiE. UNDERWOOD, citizens of the UnitedV States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented certain new and useful Improvements in Safety Apparatus for Elevators, of which the following is a specification, reference being had therein to the accompanying drawings. y

rlhis invention relates to af safety apparatus for elevators, and has for its object the provision of simple and eficient means that will operate for stopping an elevator cage when it descends too fast, or when the elevator cage is accidentally lowered by tle breaking of some lifting part or the li ce. i

lith this and other objects in view, our invention comprises'certain novel constructions, combinations, and arrangements of parts as will be hereinafter specifically described, illustrated in the accompanying drawings, and more particularly .pointed out in the appended claims.

In the drawings,

Figure 1 is a top plan view Vof the floor of an elevator car or cage, showing a rail associated therewith, and myV safety apparatus on the floor and operably associated with the r'ail.

Fig. 2 is a sectional view taken on line 2*-2, Fig. 1.

Fig. 3 is a view in elevation of the structure shown in Fig..1v. y

` Fig. is a diagram of theelectri'c wiring. Fig. 5 is a bottom plan view of the floor of the elevator car or cage, showing the clutch mechanism for gripping the auxili-l ary rails, while y p Fig'. 6 is a sectional view taken on line (ie-6, Fig. 5.

Referring to the drawings by numerals,v

VA. sleeve 1Q 1s fastened by means of nut 11 upon vthe'floor 1;' the lower reduced end of the sleeve 10 extends through thefloor l (Fig. 2), whereas the comparatively long On the outer end of shaft 4 is se` reduced upper end 10a carries the sliding gear 8 as well as the vertical sliding cap 12. Extending through the Lentire sleeve 10, including its reduced end portions,'is' a ro'd 13, tothe upperend of which rod is fixedly secured the cap-12. Spring arms l14, carrying adjustable weights 15, are attached at their upper endsto the outer surface of cap `to the sliding the rail6, and should, for any reason, the

car ltravel faster than desired, owing to the regulation bythe operator, of governor 9, the governor will be operated through the roller 5, shaft 4, and meshing gears 7 and 8to cause cap 12 to be drawn down on the reduced upper end 10a of the sleeve 10, se-

curely forcing rod 13 down within the sleeve, causing theV lower end of the rod to force the long blade 18 downward, breaking the circuit as shown in Fig. 4. vThe breaking ofthe circuit will deenergize the magnet 19V carried by bracket 20, which bracket 2O has pivoted, at 21, arm 22, which arm 22 carries at its upper end a large weight 23. Upon the magnet 19 being deenergiz'ed, this will cause the weight 23 to be released and dropped tothe position shown by dotted lines 24 (Fig. 3,), the weightstriking the head 25 on thevhoriz'ontal anglel arm 26 of the switch blade 27 (Fig. The switch blade 27 is pivotally mounted at 28, and normally is held between the' spring lips 29 of the switch 30. A grip'31 is fastened to the upper end of blade' 27. Upon the weight 23 striking the head 25, the blade 2 7 will be withdrawn from between the lips 29, breaking the circuit through switch 30 consequently breaking the circuit in the solenoids 32, permitting the armatures 33 to move outwardly within the solenoids 32, allowing the lever links 34 to swing outwardly on their pivots 35; this moving of lever links outwardly on theirpivots 35 will permit their wedged heads 36 to also move outwardly, acting upon the gripping jaws 37 to cause their outer vends to grip or tightly clamp the auxiliary rails 38.

tween the body of thev head andthe casingY 40, positioned upon the rod-like extension 39, is a coil spring 41; this coil spring actsV to force the head outwardly between the inner ends of the curved.gripping jaws,

when the magnet coil is denergized. vOn

thebody, of eachwedged head is a pin 42 that. isf ypositioned directly behind .the lever link so .that when the lever link, at

its outerrendyis pulled inwardly Vby reason of-a vcurrent passingfthrough theV magnet coil,this pulling of the outer end of .lever link willcausethe wedged head to move inwardly against the coil spring 41, permitting; the rollers 43 on ,the inner end of the curved gripping jaws to travel onjthe head, allowingl the outer ends of the gripping jaws to release-.the ,rail38 and permit the carfto ascend and descend freely. -In thev head 36 iS all llOIlgfated. slot 44, and in this slot 44`is la pin 45 that assists in guidingthe head in its'travel. A pin 42fL Yis positioned on each'head in front of the leverlink, tok

keep :the lever link in perfect, assembled position. lhe vhollow casing 4()v is grooved onV itsouter face, and caps 46 bear in these grooves and are held in place by bolts 47;

the inner endsvof the .rod-like extensions 39 of the wedged heads workA in the hollow guiding casing 40. n

,ln'Fig. 4,1 have shown a diagram of the wiring, yin which 48g is the battery from which extends the wire49 that leads tothe magnet 19;.thence wire 50 :leads to one of` y the terminals 16 Vthat carries the long blade 18, and thencethrough the short blade to wire 51 thatreturnsfto one of the poles on the battery-48. `Upon the car accidentallyfallin@ or travelino too fast as hereinbefore explained, the governor breaks the circuit through ,blades 17 and Vlirdeenergizing the magnet 19,"and causing the weighted Aarm to'fall and open the switch 30, which likewise denergizes the magnet coil 82, thereby operating the clutch -mechanis1n -tofcause the jaws thereof to tightlygrip the auxiliary rails 38 and stop the car. The wire 51 leads from the battery 48 to switch 30, and -wire 52 leads from switch-30 to the magnet coil,

and wire 53 leads from the magnet coil to the, battery so that a complete circuit is created through these wires and elements when thev switch 30 isgclos'ed, until the weight 23 fallsupon the head 25 of'v switch 30, opening Y the switch and breaking the circuit.

.VYhilewe have described vthe* preferred form of our safety apparatus for elevators, certain minor alterationsv or changes may be fcundnecessary in the extensive fmanufacture cff'our apparatus, and,therefore, Vwe reserve thek right tommake such minor alterations' or changes as shall appear to one `each jaw device including a pair of jaws skilled in the art to which this invention relate's, which minor alterations or changes the 4combination with a car andwith a primary` and.- auxiliary. rails, of a governorcontrolled switch carried by said car, a primary roller, means .coperating withthe primary.. roller and the governor-controlled switch for operating the same when the car descends `too rapidly', aA magnet electrically connected to said governor-controlled switch, weighted. means cooperating with said magnetand being yheld in a set position while the magnet isenergized, a second switch carried by the car and provided with an angleheaded arm in the path of movement of the weightedineans, and clutch means carried by the car and adapted to .grip or act upon the auxiliary rails when the second switch is opened by the :weighted means being released by the magnet and striking the headed arm Y'of the secondV switch.

2;'ln an apparatus of the class described,

y the combination with a car, of a clutch mechanism Secured to the bottom of the car, said ping jaw devices at each endl of the car, each device provided with curved'jaws, slotted wedged heads between the` inner ends of each of the jaws of each jaw. device, a grooved, hollow casing between the wedged heads, each head provided with a rod-like extension extending Iinto the'casing, a coil spring on the rod-like extension of each jaw between the body of the jaw and one end of the-casing, capsV resting in the groove of the casing, bolts extending through the caps and fastening the* caps against the casing, lever links pivotally mounted at their inner ends upon the car and extending across the wedged heads, pins on the heads at opposite sides of eachk link, pins in the slots of the heads for guidinglthe heads in their travel between the jaws of the aw devices, and electrically-controlled means between the outer ends yof the lever links for drawing the outer ends together and thereby leaving the jaw devices free, or releasing the outerends of the lever links and *causing the springs te act to force the wedged heads farther between A the jaws of the jaw devices for causing the outer ends 0f action.

3. In an apparatus of the class described, the combination with the floor of anelevator, of a clutch'mechanism carried by said door and comprising apair of jaw devices the jaws toexert a gripping i spring-pressed lwedged heads positioned betweenthe inner ends of the jaws, lever links extending across the heads, means on the heads whereby, whenthe llever links are swung upon their pivots or ulerurns, the

tween the ouer ends of the lever links, and

arnieures in the solenoid end Connected to the outer ends of the lever links whereby, while a current is passing through the solenoid7 the lever links will be holding the wedged heads in an inoperative position,

1.0 out when the circuit is broken through the solenoid, the lever links will be released to permit the wedged heads to spread the inner ends of the gripping jaws apart, causing the outer ends of the gripping jaws to exert a powerful gripping action.

In testimony whereof we hereuno aflix our signatures.

GEORGE P. BARKER. @LIVER nl. UNDERVOOD. 

